<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <!--  -->
    
</head>
<body>
    <div>我是div</div>
    <span>我是span</span>
    <ul>
        <li>我是li</li>
        <li>我是li</li>
        <li>我是li</li>
        <li>我是li</li>
    </ul>
    <div class="demo">
         <div class="box">
        <span class="erweima"></span>
    </div>
    </div>
   
    <script>
        //1.父节点 parentNode
        var erweima=document.querySelector('.erweima');
        // var box=document.querySelector('.box');
        // 得到的是离元素最近的父级节点(亲爸爸) 如果找不到父节点就返回为空
        console.log(erweima.parentNode);
    </script>
</body>
</html>